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support iast with fastify #6072

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IlyasShabi
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@IlyasShabi IlyasShabi commented Jul 10, 2025

What does this PR do?

This PR aims to fully support IAST with Fastify

Motivation

Plugin Checklist

Additional Notes

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github-actions bot commented Jul 10, 2025

Overall package size

Self size: 9.65 MB
Deduped: 109.37 MB
No deduping: 109.76 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.7.0 | 35.02 MB | 35.02 MB | | @datadog/native-appsec | 10.0.0 | 20.3 MB | 20.31 MB | | @datadog/native-iast-taint-tracking | 4.0.0 | 11.72 MB | 11.73 MB | | @datadog/pprof | 5.9.0 | 9.77 MB | 10.14 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.5.3 | 2.95 MB | 5.6 MB | | @datadog/wasm-js-rewriter | 4.0.1 | 2.85 MB | 3.58 MB | | @datadog/native-metrics | 3.1.1 | 1.02 MB | 1.43 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | jsonpath-plus | 10.3.0 | 617.18 kB | 1.08 MB | | import-in-the-middle | 1.14.2 | 122.36 kB | 850.93 kB | | lru-cache | 10.4.3 | 804.3 kB | 804.3 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | limiter | 3.0.0 | 157.92 kB | 157.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 7.0.5 | 63.38 kB | 63.38 kB | | istanbul-lib-coverage | 3.2.2 | 34.37 kB | 34.37 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | dc-polyfill | 0.1.9 | 25.11 kB | 25.11 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | shell-quote | 1.8.3 | 23.74 kB | 23.74 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | mutexify | 1.4.0 | 5.71 kB | 8.74 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.4 | 3.96 kB | 3.96 kB |

🤖 This report was automatically generated by heaviest-objects-in-the-universe

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codecov bot commented Jul 10, 2025

Codecov Report

Attention: Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.88%. Comparing base (ebe303e) to head (b1ea4aa).

Files with missing lines Patch % Lines
...c/iast/analyzers/set-cookies-header-interceptor.js 93.33% 1 Missing ⚠️
.../dd-trace/src/appsec/iast/taint-tracking/plugin.js 96.29% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #6072      +/-   ##
==========================================
+ Coverage   81.86%   81.88%   +0.02%     
==========================================
  Files         473      473              
  Lines       19464    19497      +33     
==========================================
+ Hits        15934    15965      +31     
- Misses       3530     3532       +2     

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pr-commenter bot commented Jul 10, 2025

Benchmarks

Benchmark execution time: 2025-07-11 13:58:17

Comparing candidate commit b1ea4aa in PR branch ishabi/fastify-iast with baseline commit ebe303e in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 966 metrics, 37 unstable metrics.

@IlyasShabi IlyasShabi force-pushed the ishabi/fastify-iast branch 4 times, most recently from ffcab54 to 8cb3a50 Compare July 11, 2025 07:28
@IlyasShabi IlyasShabi force-pushed the ishabi/fastify-iast branch from 8cb3a50 to c25c8dc Compare July 11, 2025 09:57
@IlyasShabi IlyasShabi marked this pull request as ready for review July 11, 2025 14:39
@IlyasShabi IlyasShabi requested review from a team as code owners July 11, 2025 14:39
Comment on lines +294 to +298
addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['1'] }, wrapReplyHeader)

addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['2'] }, wrapReplyHeader)

addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['>=3'] }, wrapReplyHeader)
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@CarlesDD CarlesDD Jul 11, 2025

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I think we can unify these three addHooks since they all are instrumenting the same file with the same hook

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I wanted to do the same for wrapFastify but it's okay also to use >=1. wydt ?

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if you use >=1, the intermediary major versions (2,3) won't be tested. if you want to be completely equivalent you need to do:

Suggested change
addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['1'] }, wrapReplyHeader)
addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['2'] }, wrapReplyHeader)
addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['>=3'] }, wrapReplyHeader)
addHook({ name: 'fastify', file: 'lib/reply.js', versions: ['1', '2', '>=3'] }, wrapReplyHeader)

Comment on lines +99 to +101
if (storedHeaders) {
collectedResponseHeaders.delete(data.res)
}
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This conditional is always evaluated as true

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